Enhanced bandwidth helical antenna

Details Enhanced bandwidth helical antenna Enhanced bandwidth helical antenna

1987-07-16

1992-01-14

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Spiral or helical type

343745, H01Q 1360, H01Q 1180

Patent

active

050814699

ABSTRACT:
An antenna comprises an electrically conductive helical member having a first end and a second opposite end, an elongate substrate supporting such helical member and comprised of electrically insulative material, a ground plane member disposed adjacent the helical member first end, and an impedance matching device adjacent the ground plane member. The impedance-matching device defines an inductive-capacitive circuit, inclusive of inductance constituted by a portion of the initial turn of the helical member and capacitance, one plate of which is constituted by a portion of the initial turn of the helical member. The ground plane member supports the impedance matching device for adjustable positioning circumferentially of the helical member, thereby to effect different inductances in such circuit, and for adjustable positioning radially of the helical member, thereby to effect different capacitances in the circuit.

REFERENCES:
patent: 4101899 (1978-07-01), Jones, Jr. et al.
patent: 4427984 (1984-01-01), Anderson
patent: 4495503 (1985-01-01), Morman
patent: 4571595 (1986-02-01), Phillips et al.
patent: 4644364 (1987-02-01), Parks
patent: 4644366 (1987-02-01), Scholz

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